Olbiogaster
Osten Sacken, 1886
Olbiogaster is a of small flies in the Anisopodidae (wood gnats), established by Osten Sacken in 1886. The genus is the type and sole genus of the Olbiogastrinae. in this genus are characterized by reduced wing venation compared to other anisopodids. The genus has a primarily tropical and subtropical distribution, with records from the Americas, Africa, and Asia.
Pronunciation
How to pronounce Olbiogaster: /ˌɔl.bi.oʊˈɡæs.tər/
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Identification
Olbiogaster can be distinguished from other Anisopodidae by their simplified wing venation, particularly the reduction or absence of certain crossveins. The Olbiogastrinae is defined by wing characters including a reduced anal lobe and simplified radial sector. are (bead-like) with 14 segments. Body size is generally small, with slender legs and a relatively unpatterned, dull-colored body.
Distribution
Tropical and subtropical regions worldwide. Documented from the Neotropics (Central and South America), Afrotropics, and Indomalaya. Specific country records include Brazil, Rica, and various African nations.
Similar Taxa
- SylvicolaSylvicola ( Anisopodinae) share the Anisopodidae but have more complete wing venation with additional crossveins and a more developed anal lobe.
- AnisopusAnisopus ( Anisopodinae) differ in wing venation patterns and typically have a more robust body form compared to the slender Olbiogaster.
More Details
Taxonomic history
Olbiogaster was originally described by Carl Robert Osten Sacken in 1886. The Olbiogastrinae was erected to accommodate this based on distinctive wing venation characters that separate it from Anisopodinae.
Wing venation
The reduced wing venation in Olbiogaster represents an apomorphic condition within Anisopodidae. The radial sector typically shows fewer branches, and certain crossveins characteristic of other wood gnats are absent or .